Trisazo dye and process of preparing the same



" cottonand'to the'method of preparing" the same. Morelparticularly, it is concerned- Patented May '2, 19 33 nmy JORDAN, or wrmme'ron, DELAWA E, Assmuon i'ro' I. DU Pour n1 NEMOUBSZHCOMPANY, 'or wrmmeron, DELAWARE," A CORPORATION or pm rmsAzo mm AND'IBOCESSOF. PREPARING rim sum ids itis; puca med am 17, 19 28. Serial naas azoo.

Thisinveiition relates "to'trisazo d s for with'blue dyes of excellentifastnessto light and with the rnetlio'd .or their preparation whichinvolves diazotizing an: aromatic amino compound, containing at least one acid group capable of forming a salt, coupliiig this diaz'o compoundwith a1 ha -naphthylamine-(i or 7 -sulphonic acid, 1; en diazodiazoti'zing the 'resultingdisazo intermediate and finally coupling with a l-ai'nino-8 naph thol disulphonicacid.

The, new dye compounds prepared'in this,

manner may be represented by the general formula in which, R represents: an aromatic radical containingat least one acid group capable of .forming fa salt; R represents a -1-aniino-8 "naphthol dis'ulphonic acid,and in which one of the positions X and Yisoccupied by a sulphonic acid group. e

The newdye compounds andtheir preparation are: disclosed I in the, fgllovving examplels ,oi actual embodiments of the process. It is to be understood that these examples are furnished by way of illustration only, and that the details of the procedure specified therein, as well as the particular proportions, reagents, temperatures,*-.etc'., are sus 40 ceptible of variation and substitution; In the examples the parts are given byweight. I

' Ewample 1 g Q parts of para-amino-benzoic" acid. are

dissolved in 4000 parts of iaiid 2 parts of 31% hydrochloric acid. The solutionis then diazotiz ed-at 10-15 GQiw ithl partsof sodium nitrite. The 'diazo compoundis added'toa solution'of245' partsof 1-naphthylamine-7 sodium sulphonate containing 280 parts'of crystallized sodium ace:

tatei The coupling is carried out at a tem perature'ofiabout 15 C; and'is complete'after about one hoursstirring." It is made slightly rox-p I ide, then made acid again'WithBOO PartS of alkaline by the 1 addition of sodium by 31% hydrochloricac dr A solution of 69 parts of sodium nitrite is'added at about 20 C. and the massallowed to stir for one hour.

It is then added'toa solution of 239 parts I of 2-amino-5-naphthol-7 sulphonic acid, containing 560 partsof sodium carbonate. The

. coupling temperature should be 0-5 0.

This intermediate d'ye,-which shows a'bright' violet color, is salted out with sodium chloride and filtered, The paste is stirred up with 7000 parts of water, acidified with 400 I parts of 31% hydrochloric acid and 'diazo- 'tizedat 20 C. with a solution 0f-69 partsi of sodium nitrite. After the diazo has stirred for aboutan hour, it is'added-to a solution of 341 parts'of the monosodium salt of 1- amino-8-naphthol-3 6-disulphonicacid H- acid) containing 560 parts of sodiumcarho nate. The coupling is carried outat 0-5 0.

The dye is salted outat GO-70 Qandfiltered. 'In its dryform it is-a bluish-black powder, soluble in water with a bright greenish-rblue coloration and in concentrated sulphuric'acidwith a bluish-green coloration Itdy es cottonin bright greenish-blue shades whichshow a good fastness to washin and very good -fastnesstolight. On mixed bers of cotton-silk-it leaves the silk'a pure white from a neutral soap'bathr Sodium hydrosulphite' will give a pure white discharge on the dyeings.

1 The new dye has most probably the following formula: '1

The use of 1-naphthylamine-6-sulphonic acid instead of 1:7 will produce slightly redder shades.

E wample Using 158 parts of para-amino-salicylic acid instead of 137 parts-of para-amino-benzoic acid, as in Example 1,cou'pling with thes'ame' amount of 1-naphthylamine-7 -sulphonic acid,"bu't allowing this coupling to continue overnight with agitation and leaving all other conditions the same as in Example 1, a dye is obtained which is soluble in water with a much greener blue colora- .tion than the para-amino-benzoic acid dye, dyeing cotton likewise in greener blue shades. The properties of this dye are similar to those of Example 1.

This dye has most probablythe following formula: v.

Using 187 parts ofp-toluidine-m-sulphonic :acid, instead of 137 parts of p-amino-benzoic acid,as in Example 1, for coupling with Al-naphthylamine-7-sulphonic acid, dissolving this intermediate in 4000 parts of water containing 53 parts of sodium carbonate,

-ac'id-i-fy-ing the solution with 350 parts of 31% hydrochloric acid, :then diazotizing with 69 pants of sodium nitrite, leaving all other con- .ditions the same as in Example 1, a dye is obtained which shows, practically the same shade and properties as the one described in Example 1. The dye has most probably the following formula SOaNa qNa ' EmampZe 4 Substituting 303 parts of 2-naphthylamine-6: 8disulphonic acid for 137 parts \of para-amino-benzoic acid, as in Example 1, leaving all other conditions the same as described in Example 1,.a bright greenishsblue dye is obtained, the shade and properties of which are practically the same as those of the dye described in Example 2.

This dye has most probably the following formula: V

1 Other first components may be used, as for example, In-a1nino-benzoic acid, p-sulphan'ilic acid, metanilicacid, aniline-disulphonic acid, mfxylidine-0su'1p'honic acid, '1: 4-,, 1: 5-, 1 6-, 1 7-naphthylamine-sulp'hon'ic acids, Q-naphthylamine-i:8-disulphonic acid, 2- naphthylamine-i: 7 -disulphonic acid, also amino-naphthol-sulphon ic acids, as gamma acid,'J acid, H-acid, etc.

Also, of course, other 1-amino-8-naphtholdisulphonic acids may be'employed as end components, instead of the 1 8-3 6 acid-employed in the examples. Thus 158-315., 1 8-4.: 6 and 1: 8-2 lsamino-naphthol-disu'lphonic acids may be employed as end components with very little effect .on the shade and properties of the dye.

It will be obvious that by varying the reagents employed alarge numberof dyes may be made within the scope of the appended claims. These dyes are all characterized by an unusual affinity for textiles, especially cotton, and an excellent fastness to light.

I claim:

1. A dye compound having the general formula:

HO NH:

WhereinRi represents :an aromatic radical of the benzene or naphthalene series contain- I ing at least one acid group capable of forming a salt, R represents a radical of a 1- amino 8-naphthol-disu1phonic acid and one of the positions X and Y is occupied by a sulphonic acid group.

Z ThedyestuEset forth inclaini l where- 12. The dyestufl of claim .1 in which the V in R representsangaromatic radical of the benzene or naphthalene series containing at,

least one acid group ca able of forming a salt.

3. The dyestufi set orth in claim 1 whereinR represents a radical of an aromatic sulphonic acid belonging to the benzene or naphthalene series. 1 p

4. The dyestufi' set forth inclaim 1 wherein R21 represents the radical of ll-amino-S naphthol-3 6l-disulphonic acid.

5. A dye compoundhaving the formula so|Na I H NIN radical Bi contains two sulphonic groups.

In testimony whereof, Iaflix my signature.

HENRY JORDAN.

6. The process ofpreparing atrisazo dye which comprises diazotizing an aromatic amino compound of the benzene or naphthalene series containing at least one acid group capable of forming a salt,coupling the diazo compound with an ,alpha-naphthylamine having one of theposition s 6 and 7 sulphonic eacid substituted, diazotizing the resulting diazo azo compound with 2-amino-5-naphaminoazo compound, couplingtheresulting v thol-7-sulphonic acid, diaz'otizing theresult j ingdisazo intermediate and couplin with a '1-amino-8-naphthol-disulphonic aci 7. The process'of preparing a trisazo dye which comprises diazotizing pstoluidine-msulphonicacid coupling; with l-naphthylamine-i7-sulphonic acid, diazotizin the resulting amino azo-compound, coup ingwith- 2-aminofi5-naphthol-7-sulphonic, acid, diazotizing andcoupling with 1 -amin0-8-naphthol5 I 3': 6-disulph0nic acid.

8. The dyestufi set forth in claim 1 wherein R represents a nucleus of the group comprising the benzene and naphthalene series which 'has as a substituent a. member of the groupconsisting of carboxylic and sulphonic acids.

9..The'process of preparing a trisazo dye comprising diazotizing an aromaticamino compound of the series comprising benzene and naphthalenehavingasa substituent at least one group capable of forming a salt,

cou ling the diazolcompound with an-alphap I nap thylamine-beta-sulphonic acid in which the substituents are on different rings, di-,

azotizing the resultant aminoazo compound,

couplingthe resultant with 2-amino-5-naphthol-7-sulphonic (acid, diazotizing the resultant disazo compound and coupling-with which is capable of forming a salt.

the radical R contains two acid groups each of 1 

